package com.neusoft.elm.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletResponse;

@WebFilter("/*")
public class CorsFilter implements Filter{

   @Override 
   public void init(FilterConfig filterConfig) throws ServletException { } 
   
   @Override 
   public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, 
FilterChain filterChain) throws IOException, ServletException { 
       HttpServletResponse response = (HttpServletResponse) servletResponse; 
       //注意：这里设置只允许http://localhost:8081进行跨域访问
       response.setHeader("Access-Control-Allow-Origin", "http://localhost:8081"); 
       response.setHeader("Access-Control-Allow-Credentials", "true"); 
       response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, PUT"); 
       response.setHeader("Access-Control-Max-Age", "3628800"); 
       response.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorization"); 
       filterChain.doFilter(servletRequest, servletResponse); 
   } 
   
   @Override 
   public void destroy() { }
}